Improvement in lids for gas-retorts



' ZSheets-Sheetl.

H. COLLINSON.

I was FOR GAS nmonws. No. 169,960. Patented Novi16,1875.

z Sheets-Sheet 2. H. COLLINSON.

LIDS FOR'GAS RETORTS.

No' 169,960. Patented Now-16 1875.

n TNESSESI 1 UNITE STATES PATENT O I HENRY coLnmson. or BOSTON,MASSACHUSETTS.

IMPROVEME T IN LiDS FOR GAS-RETORTS."

Specification forming part of Letters Patent No. l (9,960, datedNovember 16, 1875 application filed October 113, 1875i. i i

To all whom at may concern i Be it known that LHENRY COLLINSON, ofBoston, in the county of Suffolk and State of Massachusetts, haveinvented certain Improvements in Lids for Gas-Retorts, of which thefollowing is a specification:

My present invention relates to improvements on the invention for whichLetters Patent were granted to me on the 13th day of April, 1875, No.161,934, whereby the said invention is especially adapted forapplication to gas-retorts; and the improvements consist in the use ofa'yielding or spring support or bearing for the screw orotherdevices bywhich the lid is forced home, and in constructing and arranging theeccentric head by which the lid is supported, so that it bears only uponthe outer edge of the lid, and that it atthe same time admits acirculation of air over the outer face of the lid.

As will be seen by reference to the patent, my former inventionconsisted, essentially, in imparting to the lid or cover a sliding orgrindin g movement on its seat while being forced against the same, andin the patent I represented two methods of accomplishing such result-aneccentric head carrying the lid being in the one case formed on the endof a pressure-screw, and-in the other on a rotatingpressure-cam. v

In practice I have found that these arrangements are deficient in this,that they bring the lid to a firm bearing almost instantly after itcomes in contact with the seat, thereby rendering the grinding action sobrief as to be often ineffective. It is to'remedythis difficulty thatthe first part of my invention is intended; and it consists in soapplying a spring that after the lid comes in contact with the mouth itwill yield and allow the devices to impart a longer grinding movement tothe lid before it is brought to a firm bearing.

I have also found in practice that when the and also in making theeccentric of a skeleton form, and constructing its seat in a peculiarmanner, for the purposeof admitting a free circulationof air between thelid and eccenheated, and being thereby caused to bind.

Figure 1 is a front elevation of a retort hav- 2, a top-plan view ofthesame; Fig; 3, a vertical central section of the same; Fig. 4, a backview of the lid, showing the seat forthe ecce11 tric; Fig. 5, a backview of the eccentric.

A represents the seat or hearing on the mouth of the retort, and B thelid or cover,

edgewise thereon, and adapted to form a tight joint therewith withoutthe use of luting or seated in the back of the lid, and secured firmlyon the end of a screw, D, mounted on a cotterbar, E, which is hinged tothe mouth-piece at one end, and securedat the other by a latch, F,pivoted on the side of the mouth. G repthe swinging'en-d of thecotter-bar, with its and 2.

Upon turning the screw after the lid is swung against the mouth and thecatch engaged over the spring, the spring, holding the bar, causes thelid to bear upon the seat with an easy yielding pressure while itreceives the grinding movement from the eccentric; but as the motioncontinues, the bar, being forced outward by the screw, comes in contactwith the end of the spring and receives a solid support from the hook.so that the lid is immediately forced down firmly and immovably upon theseat. By employing the spring the grinding action of the lid is not onlycontinued a greater length of time, but is also rendered more effectivein other respects.

It is obvious that the play of the spring may be increased or diminishedand the grinding action rendered of longer or shorter duration. It isalso obvious that the spring may be ap plied in many ways, and inconnection with the same end, and that its form and arrange trio, inorder to prevent them from being overing my improved devices appliedthereto; Fig.

arranged so that it may be moved or shifted.

packing. 0 represents the skeleton eccentric,

resents aflat spring, attached to the back of end raised therefrom, insuch manner that when the hook engages over the bar it also. engagesover the spring, as shown in Figs. 1

difi'erent operating devices, for accomplishing :ment are immaterialprovided it exerts a yielding pressure on the lid while it is beingshifted on the seat.

The eccentric disk is made of a diameter nearly equal to that of thelid, and is seated in a recess or cavity in the back thereof, andsecured by an an nnlar ring or plate, a, screwed to the lid andoverlapping the edge of the eccentric, as shown in Figs, 1 and 3.

As shown in Fig. 4, the seat or recess in the lid has on its edge orperiphery small ribs, which form the only bearing on the edge of theeccentric, so that an air-space is left around the periphery of theeccentric and the parts prevented from bearing.

The front vand back faces of the eccentric may have a full flat bearing,or they may have simply narrow points of bearing, similar to those onthe periphery. The parts are also shaped in such manner that a clearair-space exists between the central portion of the ec-. centric and theback'of the lid. By the'use of the eccentric bearing only at the outeredge of the lid I am enabled to secure a better action of the lid thanotherwise, and by making the eccentric in the skeleton form andotherwise providing for the circulation of air, the

in g.

Instead of using the screw to support and operate the skeleton eccentricany equivalent device may be usedas, for example,'the camlever shownin'my original patent for operating the solid eccentric.

By the above-described improvements my patented invention is perfectlyadapted for application to gas-retorts, and a means pro.- vided by whichthe retorts may be always sealed perfectly tight without luting, and atthe same time opened and closed with facility.

Having thus described my invention, what I claim is- 1. The combination,substantially as shown and described, of a seat or hearing, A, and alid, B, having a spring-pressure against, and a sliding motion upon, theseat while being fastened in place.

2. The combination of the seat A, lid B,eccentric O, screw D, bar E,spring G, and hook F, substantially as shown.

3. In combination with the lid A,constructed and operating as described,the skeleton eocentric (J, mounted on the screw or its equivalent, andbearing on the edge of the lid.'

HENRY OOLLINSON.

Witnesses:

P. T. DODGE, WILL W. DODGE.

